CalculationsPregunta 21 de 110
A 120-V branch circuit carries 16 A over a one-way run of 80 ft using #12 Cu (circular mils = 6,530, K = 12.9). What is the approximate voltage drop?
a.5.1 V
b.3.0 V
c.2.5 V
d.7.4 V
Explicación
Single-phase VD = (2 x K x I x L) / CM = (2 x 12.9 x 16 x 80) / 6,530 = 33,024 / 6,530 = 5.06 V.
Practica las 110 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- What is the full-load primary current of a 75-kVA, 480-V, three-phase transformer?
- What is the full-load secondary current of a 75-kVA, three-phase transformer with a 208-V secondary?
- A 75-kVA transformer has a 90-A primary current (over 9 A). With primary-only protection at 125% max, what is the primary overcurrent device rating (next higher standard permitted)?
- Using the previous circuit (5.06-V drop on a 120-V circuit), what is the approximate percent voltage drop?
- A 208-V three-phase feeder carries 40 A over 150 ft using #6 Cu (CM = 26,240, K = 12.9). What is the approximate voltage drop?
- For a 112.5-kVA, 208-V, three-phase transformer with 2% impedance, what is the approximate available fault current at the secondary terminals (infinite primary)?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Master Electrician Licensing Exam (NEC-based) · Cómo revisamos